Gastroscopy as a diagnostic aid in upper gastrointestinal bleeding.
D000328:Adult; D000368:Aged; D001806:Blood Urea Nitrogen; D004381:Duodenal Ulcer / Q000150:complications; D005260:Female; D005756:Gastritis / Q000150:complications; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D005773:Gastroscopy; D006396:Hematemesis / Q000209:etiology; D006452:Hemoglobinometry; D006548:Hernia, Diaphragmatic / Q000150:complications; D006801:Humans; D008297:Male; D008551:Melena / Q000209:etiology; D008875:Middle Aged; D010439:Peptic Ulcer Perforation / Q000150:complications; D013276:Stomach Ulcer / Q000150:complications; D013997:Time Factors